Heat Controller A-VMH18DC-1 Service Service Manual Download Page 23 | Manualshive

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23

Heat Controller, Inc.

VMH SerieS

Service Manual

8.5.4 Compressor current limit protection

If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be

limited per the table below.

Cooling mode:

Current frequency(Hz)

Current limit value(A)

Frequency limit

COOL_F10

ICOOLLMT6

The compressor frequency will decrease to COOL_F4 and

then run at COOL_F4 for 3 minutes.

After that, the frequency will be adjusted according to the

capacity demand, then rise to the next level up every 3

minutes (When the frequency>COOL_F4 via capacity

demand).

COOL_F9

ICOOLLMT5

COOL_F8

ICOOLLMT4

COOL_F7

ICOOLLMT3

COOL_F6

ICOOLLMT2

COOL_F5

ICOOLLMT1

If the current frequency is lower than COOL_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>ICOOL,the AC will display the failure for 30 seconds and stop. The AC will restart 3

minutes later and re-check.

Heating mode:

Current frequency(Hz)

Current limit value(A)

Frequency limit

HEAT_F12

IHEATLMT8

The compressor frequency will decrease HEAT_F4 and

then run at HEAT_F4 for 3 minutes.

After that, the frequency will be adjusted according to the

capacity demand, then rise to the next level up every 3

minutes (When the frequency>Heat_F4 via capacity

demand).

HEAT_F11

IHEATLMT7

HEAT_F10

IHEATLMT6

HEAT_F9

IHEATLMT5

HEAT_F8

IHEATLMT4

HEAT_F7

IHEATLMT3

HEAT_F6

IHEATLMT2

HEAT_F5

IHEATLMT1

If the current frequency is lower than HEAT_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds and stop. The AC will restart 3

minutes later and re-check.

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Summary of Contents for A-VMH18DC-1 Service

Page 1: ...eat Controller Inc 1900 Wellworth Ave Jackson MI 49203 517 787 2100 www heatcontroller com SERVICE MANUAL Inverter Flex Multi Zone Ductless Mini Split Outdoor Section A VMH18DC 1 A VMH27TC 1 A VMH36QC 1 ...

Page 2: ...r Inc CONTENTS 1 General Information of Outdoor Units 3 2 Features 4 3 Dimensions 5 4 Wiring Diagram 6 5 Refrigeration Cycle Diagram 8 6 Indoor unit Combinations 10 7 Installation Details 11 8 Electronic Control Function 20 9 Troubleshooting 25 ...

Page 3: ...e Manual 1 General information of Outdoor Units Model name Dimension mm in Compressor A VMH18DC 1 845x320x700 33 3x12 6x27 6 DA130S1C 20FZ A VMH27TC 1 845x320x700 33 3x12 6x27 6 DA150S1C 20FZ A VMH36QC 1 990x345x965 39x13 6x38 TNB306FPGMC L ...

Page 4: ...y spreading the water instead of forming water droplets Operates only in heating mode except during defrosting Compressor crankcase heater It protects the valves and prevents water from dripping in the cabinet Outdoor unit Power relay control Hydrophilic aluminum fin Anti rust cabinet Valve protection cover 4 way valve control Low noise air flow system Discharge pipe temperature protection ...

Page 5: ...roller Inc VMH Series Service Manual 3 Dimensions mm in Model W D H W1 A B A VMH18DC 1 845 33 3 320 12 6 700 27 6 908 35 7 560 22 335 13 2 A VMH24TC 1 A VMH36QC 1 990 39 345 13 6 965 38 1075 42 3 624 24 6 366 14 4 ...

Page 6: ...6 Service Manual VMH Series Heat Controller Inc 4 Wiring Diagram 4 1 A VMH18DC 1 4 2 A VMH27TC 1 ...

Page 7: ...7 Heat Controller Inc VMH Series Service Manual 4 3 A VMH36QC 1 ...

Page 8: ... INDOOR OUTDOOR EXV A CAPILIARY A CHECK VALVE CAPILIARY TUBE EXV B CAPILIARY B LIQUID VALVE B GAS VALVE B Accumulator 5 2 Refrigeration circuit drawing of inverter tri zone A VMH27TC 1 LIQUID VALVE A GAS VALVE A HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER Compressor 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor T3 Condenser temp sensor T5 Discharge temp sensor T4 A...

Page 9: ...ssor 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor T3 Condenser temp sensor T5 Discharge temp sensor T4 Ambient temp sensor INDOOR OUTDOOR EXV A CAPILIARY A CHECK VALVE CAPILIARY TUBE EXV B CAPILIARY B LIQUID VALVE B GAS VALVE B EXV C CAPILIARY C LIQUID VALVE C GAS VALVE C EXV D CAPILIARY D LIQUID VALVE D GAS VALVE D Accumulator High pressure switch Low pressure switch ...

Page 10: ...or unit combinations for A VMH18DC 1 Comb Combinations Unit A Unit B Dual 1x1 9k 12k 18k Dual 1x2 9k 9k 9k 12k 6 2Indoor unit combinations A VMH27TC 1 Comb Combinations Unit A Unit B Unit C TRI 1x1 9k 12k 18k TRI 1x2 9k 9k 9k 12k 9k 18k 12k 12k TRI 1x3 9k 9k 9k 6 3Indoor unit combinations A VMH36QC 1 Comb Combinations Unit A Unit B Unit C Unit D QUA 1x1 9k 12k 18k QUA 1x2 9k 9k 9k 12k 9k 18k 12k 1...

Page 11: ...nits must meet all NEC and local codes with respect to the unit s rating plate We recommend using 14 AWG 4 conductor Stranded THHN 6 Ф Ф V cable Pipe length and elevation Unit Pipe size Standard length m Max Elevation B m Max Length A m Additional refrigerant g m Gas inch mm Liquid inch mm 9K 3 8 Ф9 52 1 4 Ф6 35 5 16 5ft 10 33ft 15 50ft 20 0 2 oz ft 12K 18K 1 2 Ф12 7 1 4 Ф6 35 Max Total length for...

Page 12: ...ome out the connections have leaks and those connection points must be tightened Recheck to ensure all leakage points are tightened properly and not leaking 1 Air purging with vacuum pump 1 Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge hose with the push pin of handle lo to the 3 wa...

Page 13: ...valve 2 Air purging by refrigerant Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve 3 Air purge by open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 m...

Page 14: ...e which you disconnected from the vacuum pump to the valve at the bottom of the cylinder Because refrigerant is R410A turn the cylinder upside down ensuring the bottom is upward to create a liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the chargi...

Page 15: ...y valve and the 3 way valve Connect the charge hose to the valve at the bottom of the cylinder Because the refrigerant is R 410A turn the cylinder upside down such that the bottom is upward to ensure a liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air Do not vent refrigerant into the atmosphe...

Page 16: ...cedure 1 Confirm that both the 2 way and 3 way valves are set to the open position Remove the valve stem caps and confirm that the valve stems are in the open position Be sure to use a hexagonal wrench to operate the valve stems 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold val...

Page 17: ...and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leave the valve on the charging cylinder closed 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After p...

Page 18: ...k the gas leakage using soap water 7 7 Replacing the outdoor unit 1 Evacuation for the whole system Procedure 1 Confirm that both the 2 way and 3 way valves are set to the open position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuate for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the valve Low side on the charge set turn off the vacuum pump a...

Page 19: ...record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g 5oz each time operating the air conditioner in the cooling cycle Wait approximately 1 minute and then repeat the procedure as needed 5 When the electronic sca...

Page 20: ...ociated error code or protection code 8 4 Outdoor unit point check function There is a check switch in outdoor PCB Push the switch SW1 to check the states of unit when the unit is running The digital display will display the following each time the SW1 switch is preserved No SW1 Pressed Display Remark 1 Indoor unit capacity demand code 2 Outdoor unit running mode code Off 0 Cooling 1 Heating 2 3 A...

Page 21: ...t Actual data 23 Ambient temp of 2 indoor unit Actual data 24 Condenser pipe temp of 2 indoor unit Actual data 25 Ambient temp of 3 indoor unit Actual data 26 Condenser pipe temp of 3 indoor unit Actual data 27 Ambient temp of 4 indoor unit Actual data 28 Condenser pipe temp of 4 indoor unit Actual data 29 Check point over The following items from 6 4 1 to 6 4 6 are for the explanation of the poin...

Page 22: ...ill be limited as below rules If 216 F T5 239 F 102 C T5 115 C the frequency or the compressor will decrease to a lower level every 2 minutes until it reaches F1 If T5 239 F T5 115 C for 10 seconds the compressor will stop and restart till T5 194 F T5 90 C 8 5 3 Low voltage protection VOLLIMT1 VOLTAGE No limit VOLLIMT2 VOLLIMT3 Off VOLFRE2 VOLFRE1 VOLREL1 VOLREL2 VOLREL3 Model VOLLIMT1 VOLLIMT2 VO...

Page 23: ...4 the frequency will not be limited After 10s of the compressor start if the current ICOOL the AC will display the failure for 30 seconds and stop The AC will restart 3 minutes later and re check Heating mode Current frequency Hz Current limit value A Frequency limit HEAT_F12 IHEATLMT8 The compressor frequency will decrease HEAT_F4 and then run at HEAT_F4 for 3 minutes After that the frequency wil...

Page 24: ... resume to the former frequency Model RECOILINFRE A VMH18DC 1 45 A VMH27TC 1 45 A VMH36QC 1 40 2 During the oil return process the EXV and indoor units continue with the current running mode the frequency will not be limited by the compressor discharge temp or the current 8 5 9 Compressor preheating functions Preheating permitting condition If T4 outdoor ambient temperature T4 37 4 F T4 3 C and ne...

Page 25: ...rent protection P4 P1 Voltage protection E5 P2 Temperature protection of compressor top P0 P1 P2 P3 Outdoor temp too low protection Optional for some models P4 Inverter compressor drive protection E7 P7 P5 Mode conflict Indoor Ceiling Cassette error codes Operation Timer De frost Alarm LED STATUS X X X Open or short circuit of T1 temperature sensor X X X Open or short circuit of T2 temperature sen...

Page 26: ...coil outlet temp sensor or connector of sensor is defective E5 E4 Open or short circuit of outdoor unit temperature sensor E5 E5 Voltage protection P1 E7 Communication malfunction between IPM board and outdoor main board P4 P0 Temperature protection of compressor discharge or compressor top For A VMH 36QC 1 it means Temperature protection of compressor discharge P2 P1 High pressure protection Only...

Page 27: ...CB directly Otherwise check whether the EEPROM chip plugged in PCB well Yes No Yes Insert the EEPROM well Replace the indoor PCB Shut off the power supply and turn it on 1 minute later Is it still displaying the error code EEPROM a read only memory chip whose contents can be erased and reprogrammed using a pulsed voltage EERROM chip may be solid for some models Re insert the EEPROM well ...

Page 28: ... On Refer PIC 3 Is PFC power LED lamp off Refer PIC 3 No Yes Power off then Power on the A C by the Breaker Did E1 error code turn off change IPM No No Yes Yes Are number of indoor units correct Check on the outdoor check point 18 2 for dual zone 3 for tri zone 4 for qua zone Refer PIC 5 Is Main board lamp on Refer PIC 4 Reconnect the wiring No A Is all the wiring between terminal and Indoor PCB c...

Page 29: ...board LED when power on and unit standby PIC 5 check point bottom press 18 times to check how many indoor units are connected Pic 1 Measure the voltage of L2 to S Vs is it moving alternately between positive value and negative value PIC 3 IPM For dual tri quad zone PFC quad zone only ...

Page 30: ...e indoor fan motor Check the wires of fan motor Are all the connections good No Yes No Correct the connections No Yes Replace indoor main PCB Is it still displaying the error code Yes Yes Check the voltage between port 1 and 6 of fan motor connector is it 310V No DC motor voltage input and output NO Color Signal Voltage 1 Red VDC 310V 2 3 White Vcc 15V 4 Blue FG 0 3V 5 Yellow Vsp 0 7 5V 6 Black GN...

Page 31: ...ate the cross fan by hand Does it rotate properly The unit operates normally Disassembly the connection between fan and motor check if the bearing is normal Replace the bearing Check the wires of fan motor Are all the connections good No Yes No No Replace indoor fan motor Yes Correct the connections No No Yes Yes Check the resistance value of indoor fan motor is it normal Replace indoor PCB Yes fr...

Page 32: ...appen again Check the resistance value of the sensor via Appendix 1 is it normal No 9 3 1 7 Full water malfunction For Ceiling Cassette If the water level switch is inserted well No Insert the water level switch well If the water level switch is broken Yes Replace the water level switch If the water pump is normal No Replace the water pump Yes No Yes Check PCB board or replace the indoor main PCB ...

Page 33: ... ambient temperature sensor Turn on the unit when outdoor ambient temperature is in normal operation temperature range 9 3 2 Outdoor unit trouble shooting 9 3 2 1 Outdoor EEPROM malfunction ODU E0 Outdoor EEPROM malfunction Yes No Insert the EEPROM well Replace the outdoor main board If the EEPROM chip is welded on PCB replace the PCB directly Otherwise check whether the EEPROM chip plugged in PCB...

Page 34: ...L1 and N L2 is about 220 240VAC Check the power supply Check whether the voltage of IPM board P and N is normal DC277 356V for 18 27KBtu h DC277 410V for 36KBtu h Replace bridge rectifiers and then check whether the system can run normally Replace IPM board and then check whether the system can run normally Replace outdoor main board Yes No No No No Yes Trouble is solved Yes Yes ...

Page 35: ...least one LED in the IPM board light Check the signal wire between the IPM module and the main board is it connected good Reconnect and retry Is error still display Replace IPM board and then check whether the system can run normally Replace the electric control box No No No No Yes Trouble is solved No Yes Replace outdoor main board and then check whether the system can run normally No Yes Yes lit...

Page 36: ...s a refrigerant leak Yes No Check whether the resistance of compressor discharge temp sensor is right refer to the Appendix 2 The discharge temp sensor may be broken Check whether the wiring connection is correct between compressor discharge temp sensor and PCB according to wiring diagram Correct the wiring connection Replace the compressor discharge temp sensor Replace outdoor main board Stop lea...

Page 37: ... clogging of capillary tubes etc Properly charge the system Replace the outdoor main PCB Replace the protector Reconnect and retest Are all connections correct Check whether protector is normal If protector is normal resistance 0 Is the unit properly charged Is there any abnormality of operation after the system was charged Does the compressor operate No No Yes No No Yes Yes No ...

Page 38: ...Reconnect it properly No High pressure protection Is the wiring between the high pressure switch and main control board is connected correctly No Yes Yes Yes Yes Yes Is the high pressure protector broken Short circuit the high pressure protector socket check whether the system can run normally now Yes Check whether the refrigerant system is ok Check whether the outdoor ambient temperature is highe...

Page 39: ... find the leak and repair Stop the unit Replace low pressure protector Reconnect it properly No Low pressure protection Is the wiring between the low pressure protector and main control board connected correctly No Yes Yes Yes Yes Is the low pressure protector broken Short circuit the low pressure protector socket check whether the system can run normally now Check whether the refrigerant system i...

Page 40: ...ilation Stop the unit No Current protection of compressor Check whether the input current of the power supply wire is more than 12 5A For 27K it is 14 5A For 36K it is 20A Yes Yes Yes Yes Check whether the refrigerant system is ok Check whether the outdoor ambient temperature is higher than 122 4 F 50 C Check whether the outdoor unit s airflow is obstructed Check whether the heat exchanger is dirt...

Page 41: ...board and the IPM module is connected tightly Connect it well check ok or not Connect it tightly check ok or not No No No Yes Yes No Yes Yes No No No Check whether the input power supply is correct 220 240V 1PH 60Hz Regulate it to correct then check whether the system can work normally Check whether the power supply line is connected correctly and tightly Connect it correctly and tightly check ok ...

Page 42: ...Check whether the condenser temperature is more than 149 F 65 C Check whether the outdoor ambient temperature is higher than 122 F 50 C Check whether the heat exchanger is dirty The refrigerant circuit is blocked No No Yes Yes Yes Yes Yes No 9 3 2 10 High temperature protection of condenser ODU P6 When outdoor pipe temp is mroe than 149 F 65 C the unit will stop and will run again when outdoor pip...

Page 43: ...module protecton Replace the outdoor main board Replace the inductance Replace the PFC module Check whether the voltage range of P N on IPM module is normal DC277 356V for 18 27KBtu h DC277 410V for 36KBtu h Check whether the inductance of PFC module is good If the inductance is good the resistance of the two ports is 0 Check whether the connecting line between main board and the PFC module is con...

Page 44: ...41164 4 44 0000 36 6 13059 76 1 34105 116 0 40060 3 41 5878 37 5 87359 77 1 29078 117 0 38991 2 39 8239 38 5 62961 78 1 25423 118 0 37956 1 37 1988 39 5 39689 79 1 21330 119 0 36954 0 35 2024 40 5 17519 80 1 17393 120 0 35982 1 33 3269 41 4 96392 81 1 13604 121 0 35042 2 31 5635 42 4 76253 82 1 09958 122 0 3413 3 29 9058 43 4 57050 83 1 06448 123 0 33246 4 28 3459 44 4 38736 84 1 03069 124 0 32390...

Page 45: ... 2 489 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 82 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79 7 086 119 2 174 0 180 9 40 29 15 80 6 859 120 2 117 1 171 9 41 28 81 6 641 121 2 061 2 163 3 42 26 9 82 6 43 122 2 007 3 155 2 43 25 86 83 6 228 123 1 955 4 147 6 44 24 85 84 6 033 124 1 905 5 140 4 45 23 89 85 5 844 125 1 856 6 1...

Page 46: ... DC b Inverter module U V W 3ph Result U V 60 150V AC U W 60 150V AC V W 60 150V AC P N DC 310V 2 Check the Diode Bridge component In wiring diagram rectifier Remark If this part is abnormal the LED will not light Multi meter Result Forward Resistance Backward Resistance _ Infinite Infinite 1 7M ohm Infinite 1 7M ohm Infinite ...

Page 47: ...47 Heat Controller Inc VMH Series Service Manual Appendix 4 ...

Page 48: ...YDK70 6FB YDK180 8GB Indoor unit Model 9k Mini Split 12k Mini Split 18k Mini Split Indoor fan motor RPG20B RPG20B RPG28H Model 12k Cassette 18k Cassette Indoor fan motor YDK45 6B YDK45 6B 1 Compressor checking Measure the resistance value of each winding by using the tester Position Resistance Value DA130S1C 20FZ DA150S1C 20FZ TNB306FPGMC L Blue Red 0 95Ω 20 0 95Ω 20 0 53Ω 20 ...

Page 49: ...K45 6B YSK25 6L Black Red 56Ω 8 20 24 5Ω 8 20 317Ω 8 20 145Ω 8 20 345Ω 8 20 627Ω 8 20 Red Yellow 76Ω 8 20 19Ω 8 20 252Ω 8 20 88Ω 8 20 150Ω 8 20 374 3Ω 8 20 Yellow Blue 76Ω 8 20 19Ω 8 20 252Ω 8 20 88Ω 8 20 150Ω 8 20 374 3Ω 8 20 Measure the resistance value of each winding by using the tester Position Resistance Value RPG20B RPG28H Black Red 381Ω 8 20 183 6Ω 8 20 White Black 267Ω 8 20 206Ω 8 20 ...

Page 50: ...04 2009 10 2012 ...

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